Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.yandex.ru");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

        Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
                    @Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication("yandex.user", "yandex.password");
                    }
                });

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("yandex.user@ya.ru"));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("a@grasoff.net"));
        message.setSubject("Subject");
        message.setText("Text");

        Transport.send(message);